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Filtering by: Alternative title ssim Studies in zoology no. 4 Creator Floyd, Donald J. Degree Name Doctor of Philosophy (Ph.D.)

Early development of the endocrine system in salmonids : regulation of sex differentiation and ontogeny of the stress response

Creator:

Floyd, Donald J.

Abstract:

Sex steroids, follicle stimulating hormone (FSH), luteinizing hormone (LH) and gonadotropin releasing hormone (GnRH) were measured in monosex and mixed sex populations of rainbow trout during early development. Steroids declined following fertilization, increased at hatch, then fell and remained constant thereafter. Trends toward differences in steroids between males and females...

Resource Type:

Dissertation

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control fish were found 1 week after hatch and persisted for the remainder of the study. A decrease in
Ryegrass fluorescence expression during three generations of seed increase and its heritability among half-sib families

Creator:

Floyd, Donald J.

Abstract:

Seedling root fluorescence (SRF) has been used as a test in the USA since 1941 to discriminate Italian ryegrass (Lolium multiflorum Lam.) from perennial ryegrass (L. perenne L.). Generally, roots of Italian ryegrass fluorescece when exposed to ultraviolet light, while roots of perennial ryegrass do not. Presence of fluorescent seedlings...

Resource Type:

Dissertation

Full Text:

in descriptions. Based on results of these studies, SRF level for a cultivar developed from a